Cutter chain



May 25 5 1926.

J. W. ZELLERS CUTTER CHAIN Filed June 18, 1924 Patented May 25, 192%.

uiresraras JOHN .VILLIAM ZELLERS, OF CHICAGO, ILLINOIS, ASSIGNOR TOGOODMAN MANUFAC- TUBING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

CUTTER CHAIN.

Application filed June 18, 1924. Serial No. 720,733.

This invention relates to improvements in cutter chains for miningmachines and has for its principal object to provide a simply anddurably constructed chain block.

The invention may be best understood by reference to the accompanyingdrawings, in which Figure 1 is a side view of the chain block with thecutter bit in place therein;

Figure 2 is a perspective. view of the chain block and the cutter bit;

Figure 3 is an end view of the chain showing it inposition in the cutterhead of a mining machine, the head being indicated in dotted lines; and

Figure 4 is a sectional view taken on line 4-41 of Figure 1.

In these drawings, which illustrate one form in which my invention maybe embodied, achain block 1 is adapted to be pivotally connected toanother block by a series of straps 2, 2. The chain in use is an endlesschain driven by a sprocket and working in a grooved cutter head 3 (seeFigure 3). The blocks and straps are provided with restraining lips 5, 5and 6, 6, to retain them in the guideways 7, 7 of the grooved cutterhead. The blocks are provided with cutter bits 8, 8. The cutter chain ismade up of a series of chain blocks extending at various angles to thegrooved cutter head, as shown in Figure 3. For the purpose ofillustrating my device I have shown in detail one of such chain blockshaving its cutter bit centrally located, that is to say, perpendicularto the grooved cutter head, but it will be understood that the samefeatures of construction are used in the other chain blocks havingvarying degrees of inclination to said cutter head.

The bit 8 is preferably made of fiat bar stock, the central portion 9having a substantially uniform rectangular cross-section and with itsopposite ends forming the cutting points 10, 10, inclined with the frontor cutting face extending in an obtuse angle with respect to theadjacent front face of the central portion 9. The shape of the extremeends of the cutter bit may be varied, depending upon the workingconditions to which they are put. In the form shown a pick point isprovided.

In order to secure a bit of the shape shown and described the cutterblock is provided with a bit-receiving aperture 11 having an opening 12of rectangular shape providing a working groove for the bit when held inplace as shown in Figure 1. The lower portion of the aperture however iswidened in longitudinal section so as to accommodate the lower inclinedportion of the. bit. In the form shown the bit i'eceiving aperture isprovided with a front wall 18 which may be substantially at a rightangle to the longitudinal axis of the bit and a rear wall 14 which isinclined slightly rearwardly and inwardly from the outer face of the.bit so as to provide an inclined bearing surface for the rear face ofthe. bit. The front wall 13 and the rear wall 14 therefore divergeinwardly to provide suitable enlargement for the forwardly inclinedcutting portion 10, as clearly shown in dotted lines in Figure 1. Thebit is secured in place by means of a set screw 16 extending through thefront face of the bit block preferably inclined substantially at rightangles to the bearing surface 141 against which the cutter bit isengaged. The bottom of the aperture may be provided with a communieatingpassage 17 which may be desirable for supporting the bit aperture corein cases where the block is cast.

The block and bit construction as above described affords a simple anddurable device in which the cutter bit having double cutting ends andespecially these cutting ends inclined forwardly in the main body of thebit may be securely clamped in place in the block. The bit is maintainedin engagement with a solid bearing surface along the rear face which isparticularly desirable in cutter chains of this character, and said bitprojects from the cutter block at a forwardly inclined angle. A

Although I have illustrated and described one form in which my inventionmay be embodied, it will be understood that the construction andarrangement of the various parts may be altered without departing fromthe spirit and scope of the invention. Furthermore, I do not Wish to beunderstood as limiting myself to .the particular construction shown,excepting as it may be defined in the appended claims.

I claim as my invention:

1. A chain block for mining machines having a bit provided with acentral portion substantially uniform in cross-section and provided withoffset cutting portions at opposite ends thereof, said chain block beingprovided with a bit-receiving aperture having its outer margins adaptedto conform substantially with the cross-section area of said centreportion of the bit and having its inner portion enlarged in crosssectionto receive the offset portion of the bit, and means for securing saidcutter bit in said aperture.

2. A chain block for mining machines having bit provided with a centralportion substantially uniform in cross-section and provided with otl'setcutting portions at opposite ends thereof, said chain block beingprovided with a bitreceiving aperture the front and rear walls whereofdiverge inwardly, and means for securing said cutter bit in saidaperture.

3.1; chain block for mining machines having a bit provided with acentral portion substantially uniform in cross-section and provided Withoffset cutting portions at opposite ends thereof, said chain block beingprovided with a bit-receiving aperture having a substantiallyperpendicular front wall and an inwardly and rearwardly inclining rearwall, and means for securing said cutter bit in said aperture.

4:. A chain block for mining machines having a bit provided with acentral P01 tion substantially unlform in cross-section and providedwith offset cutting portions at opposite ends thereof, said chain blorl;being provided with a bit-receiving aperture the front and rear wallswhereof li-- verge inwardly, and a set screw at right angles to thecentre portion of said cutter bit for securing the latter in saidaperture.

5. A chain block for mining machines having a bit provided with acentral portion substantially uniform in cross-section and provided withoffset cuttiig portion; at opposite ends thereof, said chain block beingprovided with a bit-receiving aperture, the forward wall whereof issubstantially at right angles with the upper margin of the block and therearward wall diverging rearwardly and inwardly, and a set screw forsecuring said cutter bit extending through said front wall andsubstantially at right angles with the rear wall of said aperture.

Signed at Chicago, county of Cook and State of Illinois, this 2nd day ofJune, A. D. 1924:.

JOHN WM. ZELLERS.

